^ I think the wall is intended to have a rounded undercut like that, it isn't a mistake. Although the base panel could be better painted.

I know it's supposed to curve in like that, I meant that bit of black you could see at what looks like the edge of the carpet, there's so little of the baseboard showing there but enough that it looks like SOMETHING, almost like floor continuing from the edge of the carpet. I suppose they didn't think the baseboard would be seen at all, like the underside of the railing.